Quantitative analysis method and device of main controlling factor of oil layer remaining oil

Abstract

The invention provides a quantitative analysis method and device of a main controlling factor of oil layer remaining oil. The quantitative analysis method comprises the following steps: according to the washing data of each rock core, determining the situation of the remaining oil in each rock core; according to stratum depth, homing each rock core to each oil layer, and determining the situation of the remaining oil in each oil layer; taking a coring well as a center to establish a coring dissection well block; according to the situation of the remaining oil in each oil layer, judging influence on the situation of the remaining oil in each rock core by the main controlling factor of an oil layer plane, the main controlling factor between the oil layers and the main controlling factors in the oil layers, and determining the main controlling factor of the remaining oil of each rock core; and according to different oil layer types or deposition types to which each rock core belongs, carrying out classification statistics on the thickness of the rock core, and carrying out the classification statistics on the thickness of the rock core with different main controlling factors of the remaining oil and a proportion. Dynamic data and static data are comprehensively applied, workload is reduced, subjective and objective factors and causes which affect the remaining oil on the plane, between the layers and in the layers can be effectively and simply clarified, and the potential of each class of remaining oil is evaluated.

Description

technical field [0001] The invention relates to the technical field of oil reservoir development and processing, in particular to a quantitative analysis method and device for main controlling factors of remaining oil in an oil layer. Background technique [0002] Remaining oil mainly refers to the underground crude oil that cannot be recovered after a certain oil recovery method has been exploited in an oil reservoir. Generally, it includes two parts: the crude oil in the dead oil area that the oil displacement agent cannot reach and the residual oil that the oil displacement agent (water injection) has reached but still cannot drive out. The amount of remaining oil depends on geological conditions, crude oil properties, types of oil displacement agents, development well pattern and production technology. [0003] Prediction and monitoring of remaining oil distribution is the foundation and basis for gradually enhancing oil recovery in different development stages. Traditi...

AI Technical Summary

Problems solved by technology

For the prediction of remaining oil, the above method uses relatively single technical data and means, and can only macroscopically evaluate a single type of remaining oil affected by interlayer or plane heterogeneity, and lacks quantitative evaluation of the main controlling factors for the cause of remaining oil

[0004] The distribution of remaining oil in high water-cut oilfields is more complex and highly dispersed, and fine remaining oil prediction has become a trend of technological development. The combination of static data makes the remaining oil objects more finely characterized, but there are still problems in the prediction accuracy and accuracy, mainly including the complex and numerous dynamic and static data required, the huge workload, and the heterogeneity within and between layers. The complexity of water flooding conditions and the interactive distribution of multiphase fluids have affected the accuracy of instrument and equipment identification and the effectiveness of process technology, and the completeness and accuracy of the data have restricted the accuracy and results of fine prediction of remaining oil

[0005] Especially in the stage of high water cut, the intra-layer contradiction rises to become the main contradiction, the low-efficiency and ineffective circulation is serious, the effectiveness of conventional technical means for increasing the swept volume is obviously reduced, and the intra-layer contradiction has become the bottleneck of the effective development of high water-cut oilfields. The main controlling factors and proportion of remaining oil provide a basis for tapping the potential in the layer. At present, there is no effective prediction and quantitative evaluation technology for remaining oil in the layer, and research is urgently needed

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